yes you can !!!
just download kingoapp from this link: http://www.kingoapp.com/
or you can see a video on youtube about it just search for how to root the samsung galaxy note 3 without tripping knox
the will provide you with the download link and teach you how to use kingo app

Yeah go to towelroot.com click on the towelroot logo In the center of the screen it'll start the download. When it downloads click on it and install. Then open the towelroot app and click make it rain. This gives you root access to all root required apps etc. It won't trip Knox.

From what I have read root de la vaga wont trip knox but installing a custom rom or recovery will trip knox. Unless you want to keep your warranty in place or you have a need for knox ie work, then tripping knox shouldn't be of any concern.

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